Originally Posted By: Art_Vandelay
Let me clarify:
- I mean exactly -54C. Not -53, -65, -48 etc.
There is no magic in the number -54°C. The flash point procedure (ASTM D-92) calls for passing the flame every 5°F or 3°C. If you run the test with a Centigrade thermometer you will check for a flash in 3°C increments, so you can get -51, -54, -57 etc. If you run it with a Farenheit thermometer you check every 5°F, so you can get -60, -65, -70 etc. If you run it in Farenheit and convert to Centigrade, -65°F exactly equals -54°C.
Tom NJ